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Climate change and global warming

Mary Ann Once

mary ann once

on 14 October 2012

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Transcript of Climate change and global warming

Is a significant and lasting change in the statistical distribution of weather patterns over periods ranging from decades to million of years. Climate change and global warming CAUSES Glaciers- are considered among the most sensitive indicators of climate change.
Arctic sea ice loss- sea ice is frozen seawater that floats on the ocean surface.
Vegetation- some changes in climate may result in increased precipitation and warmth, resulting in improved plant growth and the subsequent sequestration of airborne CO2. Historical and archeological evidence GLOBAL WARMING The greenhouse effect is the process by which absorption and emission of infrared radiation by gases in the atmosphere warm a planet’s lower atmosphere on surface. Greenhouse effect Climate change is caused by
factors that include: *Oceanic processes
*Variations in solar radiation received by Earth
*Plate tectonics
*Volcanic eruptions
*Human-induced alterations of the natural world. Causes:

The rate at which energy is received from the sun and the rate at which it is lost to space determine the equilibrium temperature and climate of the Earth. Orbital variations- slight variations in Earth’s orbit lead to changes in the seasonal distribution of sunlight reaching the Earth’s surface and now it is distributed across the globe.
Solar output- is solar activity during the last several centuries based on observations of sunspots and beryllium isotopes.
Volcanism- volcanic eruptions release gases and particulates into the atmosphere.
Plate tectonics- over the course of a million of years, the motion of tectonic plates reconfigures global land and ocean areas and generates topography.
Human influences- which is the human activities which affect the climate Is the rise in the average temperature of Earth’s atmosphere and oceans since the late 19th century and it is projected continuation.
Since the early 20th century, Earth’s mean surface temperature has increased by about 0.8 °C (1.4 °F). Greenhouse gases Greenhouse Gases
*water vapor (H2O)
*carbon dioxide (CO2) *methane (CH4)
*nitrous oxide (N2O)
*ozone (O3) CAUSES Methane  a chemical compound with the chemical formula CH4. It is the simplest alkane, Nitrous oxide
commonly known as laughing gas, is a chemical compound with theformula N2O. It is an oxide of nitrogen. At room temperature, it is a colorless, non-flammable gas, with a slightly sweet odor and taste. Ozone 
or trioxygen, is a triatomic molecule, consisting of threeoxygen atoms.
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